Unsurprisingly, those details are being kept under tight wraps, hardly an unpredictable outcome from the fiercely privacy-protecting actress. Though the duo are frequently seen arm in arm around their neighborhood, they have yet to make a public appearance together.

The 27-year-old Seeking a Friend for the End of the World star has been dating the 28-year-old Righton since 2011 after being introduced by mutual pal Alexa Chung. The couple was soon inseparable and moved into a shared East London pad together at the start of this year.

No further details about the engagement, including when or how the proposal took place, or a possible wedding date, have been revealed.

It'll be the first time down the aisle for both stars. Knightley previously dated actor Rupert Friend for five years before splitting in early 2011, and model Jamie Dornan, whom she dated for two years before that.

Congrats, you two!

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